Hydraulic dump.



G. A. WOOD.

HYDRAULIC DUMP.

APPLICATION men 00121. 912.

1,165,825. Patented Dec. 28, 1915.

2 SHEETS-SHEET 1.

Wz'fnesses: PH 20 26307:

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G. A. WOOD.

HYDRAULIC DUMP.

APPLICATION FILED OCT. 21. m2.

Patented Dec. 28, 1915.

2 SHEETS-SHEET 2- GABFlILD 5.. WOOD. ST. P131.

MINNESOTA. ASSIGZTOP. O? OPE-HALF TO GHANT WALL-BREE, 0? ST. PAUL,MINNESOTA.

DUMP.

Appliwtion filed October 21. 1912.

To {322 2:11am. it may concern:

Be it lmown that I, GARFIELD A. Wooo, a citizen of the United States.residing at St. Paul, in the county of Ramsey and State of Minnesota,have invented a new and us ful Improvement in Hydraulic Dumps, of whichthe following is a specification.

The object of this inrention is to provide a simple and etl'ectireapparatus for tilting the body of an automobile truck for the parpose ofquickly dumping the contents of the bodv.

More particularly this invention comprises a hydraulic ram operablyconnected with the body of the truck to lift one end thereof. said rambeirg actuated through ower derived from the engine which is emplored topropel the track.

This invention further comprises features of construct on andcombinations of parts which will be hereinafter more particularlydescribed and claimed.

In the accompanying forming part of this specification, Figure 1 is aside elevation of an automobile truck showing my invention appliedthereto; Fig. 2 is a diagrammaticyiew of my improved apparat'us andFigs. 3. 4, 5, 6 and 7 are views of details, partof which areillustrated in sec- Don.

In the drawings A. indicates an automobile truck of ordinaryconstruction having front wheels 2 and drive wheels 3. The engine B ismounted on the frame 4 in the usual manner and the carrying body C ishinged-at 5. near the rear of the frame 4. The forward end of the body Cnormally restsonthe fi-amehandanarmtiisfreely journaled centrally on thebottom of the body in supports 7. The arm 6 is bifurcated on its freeends to extend on either side of a hydraulic cylinder E which issupported by the frame 4 in any suitable manner just back of the driverscab D.

A yoke T which is pivoted at 8 to the piston rod 9 of the cylinder E andextends downward on either side of the cylinder. is pirotally connectedat 10 to the bifurcated ends of the arm 6- The cylinder E is shown ininclined which is merely for convenience. it being obvious that it maybe set vertical if desired. As illustrated in 1, braces 11 assist inholding the cylinder E in position.

The piston 12 is connected to the piston Specification of LettersPatent.

Patented Dec. 28, 1315.

Sorrel Es. 226,329.

rod 9 in the usual manner and normally is in the position illustrated inFig. A IO tary gear pump 13 of ordinary design is mounted on the engineframe F and is operated by gears ll and 15, the gear 15 being freelyjournaled on a counter shaft 16 between collars 17. An ordinar dogclutch 18 is slidably keyed to the counter shaft 16 and is thrown in andout of gear with the gear 15 by the lever 19 and foot lever '20 which isoperated by the driver of the truck when desired.

The shaft 16 is connected with the engine shaft 21 by gears 22 asillustrated in Fig. 7 or in any other suitable manner. Piping forming aloop 23 iseonnected to either side of the gear pump 13 and a suitablevalve 24 is inserted in said loop so that it can be easily operated bythe driver of the truck by alever or handle 25.

The cylinder E is connected at its lower extremity to the loop 23 bypipe :26. and a by-pass pipe 27 which is closed by the valve The valve28 is operated by levers '29 and a 30 which normally holds the valve 28in a closed position. Near the upper end of the cylinder E is a port 31which is-connectcd to the valve 24 by pipe The cylinder E and itsconnecting pipes together with the gear pump are adapted to be filledwith heavy oil or glycerin and oil through the port 3-3 atthe top of thecylinder E, a small space being left inthe top of the cylinder for theexpansion of the liquid.

In operation when it is desired to dump the contents of the body C theoperator throws the clutch 18 by means of the levers 19 and 20 intoconnection with the gear 15 which operats the gear pump 13 by the engineB and the valve 2 is turned into the position illustrated in Fig. 6directing the flow of liquid to the piston through the 26 causing it torise, in the cylinder E md at the same time elevating the forward end ofthe body C by means of the yoke 7' and connecting arm 6. When the pistonreaches a point just above the port 31 it will stop automatically andthe liquid will flow out through the port 31. pipe 3? and valve to thegear pump 13 and continue through loop '23 and pipe 26 to the cylinder Ethus holding the piston 12 in elevated position making an automaticsafety arrangement so that the operator or driver can start the pump 13and then go back to the rear of the truck and open the body C to allowthe contents to empty while the body is elevating without any attentionto the elevating parts If it is desired to stop the pump 13 and hold thepiston 12 and body C in elevated position the operator turns the valve24 into the pcsition illustmted in Fig. 2 stopping the fiovv of liquidwhich holds the piston in the desired position. When it is desired tolower the piston 12 and body C the valve 24 is turned into the positionillustrated in Fig. 5 and the gear pump may or may not be used as theweight of the body is to force the liquid to the other s'de of thepiston, the liquid forming a cushion for the descending body, whichprevents any impact between the body and frame. A

cking 34 can be used around the piston 9 at the top of the cylinder toprevent any leakage of liquid. In elevating the piston 12 if air getsinto the gear pump 13 it will not produce a strong enough flow of liquidto start the piston up, the operator then opens the valve 28 by thelevers :29 which open the by-pass 27 and allovvs the liquid to shortcircuit through the cylinder around the piston. The air will then riseto the top of the cylinder where it will be separated from the oil. Thevalve 28 is then closed and the piston 12 elevated The gear pump 13 isadapted to be operated continually by the engine B by leaving the valve24 in the position illustrated in Fig. 2 the liquid around the loop 23.An important feature of my invention is that when the body C is elevatedto the extreme dumping position theconnectionslflareinlinewiththecenterofthe cylinder E, thus preventhigany lateral strainonthepi.stonrod9,whichatthis point is alums; fullyextended out of the cylinder E It will also be noted that the freejoumaling of the arm 6 in the bearings 7 allows for the motion of thebody C in tilting as wonldbe true when the rear wheels of the truck arenot on the same level. This also prevents any strain on the piston rod 9when the same is elevated.

It wfllhenoted thattheport 31mustbe larger than the thicknes of thepiston 12, so that when the piston reaches the port 31 in the cons-mioft-leveling it will not close the port- 3land lcck the liquid in the tp of the cylinder E which would prevent the return of the piston. Tolimit the elevating moven mtef a stop in'the fqnm of a skew-e238 on therod'9, and thus be pgsible to operate the direction at all times. In

Fig. 3 is illustrated a detail showing an altemxtive where an expansiontank I is to the cylinder E and which opening 36 for filling the same.cylinder E in Eig. 2, has a plug 33 closing an opening in which theconnection with tank I is adapted to be secured. Any form of prime moverin place of the engine I3 may be employed for driving the equivalent ofthe pump 13, and any form of impelling medium such as oil, water andother which I now consider to represent the best embodiment thereof butI desire to have it understood that the construction shown is onlyillustrative and that the invention can be carried out by other meansand applied to uses other than those above set forth within the scope ofthe following claims Having described my invention, what I claim as newand desire to protect by Letters Patent is:--

1. A self propelled vehicle having a motor. a tiltable body mounted uponsaid vehicle, a cylinder, 2. piston in said cylinder having its redprojecting upwardly through said cylinder, a pump operated by said motorand connected with said cylinder to operate Skid pison a link from theupper end of said rod and a pted to swing Ionitudinallv. and aconnection pivoted to t lower end of said link and jonrnaled on saidbody to compensite for transverse motion of said body as regards saidpiston when said rod is in extended 2 A self propelled vehicle having apropelling motor, 'a dumping body talungly mounted on said vehicle, apump on said vehicle, means for throwing and pump into and out of with.sud motor to operate said pump,-'a hydl aulic cylinder mounted on saidvehicle having a iston which is connected to said body, a system ofpiping connecting and pump with said cylinder, a alse m said system ofpiping adapted to flow of li therehitooperate sand pinion to tilt saidbody, means for automatically stopping the upward of said piston whilesaid liquid continues to flow through said cylinder and while said motorand pump are operating means for re leasing air from mid piping intosaid cylindelabove said piston A self propelled vehicle having apropelling motor, a dumping body filtingly mounted on said vehicle, apump to said motor a hydraulic cylinder having its piston operativelconnected to body, a system 0 piping connect-Lg pump with said cylinder,a valve opted to direct the flow of liquid In said system of piping andcylinder and a secoad valve adapted to direct the flow of liquid saidpiping and cylinder without operating said piston.

4. it self propelled vehicle having a pro pelling motor, a dumping bodytiltingly Q mounted on said vehicle, a pump connected with said motor, acylinder having its piston operatively connected to said body, a circuitof piping connecting said pump with said cylinder, a valve adapted todirect the flow of liquid in said system of piping and cylinder/and avalved branch passage adapted to direct the flow of liquid through saidpiping and cylinder without operating said piston, whereby air isreleased from the pump and piping system.

5. A self propelled vehicle having a propelling motor, a dumping bodytiltingly mounted on said vehicle, a pump connected with said motor, anupwardly extending cylinder havin its piston operatively connected tosaid body, and a system of passages connecting the ingress and egressopenings of saidpum with the upper and lower ends of said cy inder, saidpiston being adapted to partly overlap the upper connection of saidpassages thereby forming a duct around said piston.

6. A self propelled vehicle having a propelling motor, a dumping bodyhinged on said vehicle, a pump mounted on said vehicle, means forthrowing said pump into and out of gear with said motor to operate saidpump, a hydraulic cylinder mounted on said vehicle having a piston rodwhich is movably connected to said body, a pipe connection between saidpump and said cylinder, and a by-pass associated with said cylinder andsaid pipe connection to permit the escape of air from and the properworking of said parts.

7. A self propelled vehicle having a propelling motor, a dumping bodyhinged on said vehicle, a gear pump mounted on said vehicle, means forthrowing said pump into and out of driving connection with said motor tooperate said pump, a hydraulic cylinder mounted on said vehicle providedwith a piston rod having a compensating connection with the free portionof said body, a system of piping having valved passages connecting saidgear pump with said cylinder, 9. loop in said piping connecting theintake and outlet of said gear pump, a

valve interposed in said loop adapted in one position to direct the flowof liquid in said system of piping and cylinder to elevate said piston,in another position to hold said piston in elevated position and inanother position to allow said piston to descend to normal positionduring the operation of said pump.

8. A self propelled vehicle having a propelling motor, a tiltable bodyhinged on said vehicle, a gear pump mounted on said vehicle, means forthrowing said pump into and out of connection with said motor to operatesaid pump, a hvdraulic cylinder mounted on said vehicle, having a pistonrod which is movably connected to said tilt- 0 iston 1n er to releaseair in said pump frame, a pump connected to the motor of said vehicle, ahydraulic cylinder disposed adjacent the free end of said body having apiston with its rod projecting upwardly, a pairof compensatingconnections secured at one of their extremities to and on opposite sidesof the upper end of Said rod and at their other extremities to the freeend of said body to permit free movement between said body and cylinderin a substantially vertical longitudinal plane, a system of pipingconnecting said pump with said cylinder, means for allowing said pump tooperate continuously with said motor and means for circulating theliquid in said system of piping and cylinder independent of theoperation of said piston.

10. A self propelled vehicle having a motor, a tiltable body mountedupon said vehicle, a cylinder, a piston in said cylinder having its rodprojecting upwardly through said cylinder, a pump operated by said motorand connected with said cylinder to operate said piston, a carryingelement supported by said rod and adapted to move longitudinally and asupporting element movably connected to said carrying element to permitof longitudinal movement of said parts and movably mounted on said bodyto compensate for transverse-motion of said body as regards said piston.

11. A self propelled vehicle having a propelling motor, a dumping bodytiltingly mounted on said vehicle, a pump connected to said motor, ahydraulic cylinder having its piston operatively connected to said body,a system of piping connecting said pump with said cylinder, a valveadapted to direct the flow of liquid in said system of piping andcylinder, a second valve adapted to direct the flow of liquidthroughsaid pip ing and cylinder without operating said piston and tensionmeans for impelling said second valve into normally closed position.

12. A self propelled vehicle having a propelling motor, a dumping bodytiltingly mounted on said vehicle, a pump connected to said motor, ahydraulic cylinder interposed between said pump and body and having itspiston operatively connected to said body, a system of piping connectingsaid pump with said cylinder and means for establishing communicationbetween the portions of said cylinder above and below said piston andwith said piping to prevent the piston locking in said cyhnder 13. Avehicle having a supporting frame, a body pivotally mounted adjacent oneend on said frame to tip, a hoist having a cylinder mounted on saidframe and extending upwardly beyond the line of travel of the other endof said body, a piston reciprocable in said cylinder having a rod proecting upwardly, a free connection between the upper end of said rod andsaid other end of said body adapted to compensate for uneven motionbetween said rod and body, a pump operatively connected with said cylnder adapted to impel a medium in said cylinder to force said pistonupwardly and raise said body and means for operating said pump 14. Avehicle having a dumping body p 1votally mounted thereon, means forraising said body relatively to said vehicle comprising a fluid pressureoperated mechanism. and means for maintaining a circulation of fluidthrough said raising mechanlsm when said body is in either elevated orlowered position.

15. A motor driven vehicle having a dumping body pivotally mountedthereon.

a i iuid pressure operated piston for elevatlng the body against/theaction of gravity, means for automatically limiting the height ofelevation of said piston, means for. maintaining a circulation of fluidthrough said cylinder for retaining said piston n ele ated position, andmeans for reversing and permitting an acceleration of the fluid flowthrough said cylinder to increase the speed of return of said piston tonormal position.

16. A vehicle having a dumping body plvotally mounted thereon, a pump, amotor for driving said pump, a cylinder having a piston and piston rodoperatively connected with said body, connections between said pump andsaid cylinder, said connections including a two-point inlet into and anoutlet from said cylinder, and means for maintaining a circulation offluid through either of said inlets, said cylinder, outlet and pump.

In testimony whereof, I have signed my name to this specification, inthe presence of two subscribing witnesses.

GARFIELD A. WVOOD. Witnesses:

H. L. FISCHER, G. H. DUBACH.

DISCLAIMER 1,165,825.Garfield A. Wood, St. Paul, Minn. HyDRAULio DUMP.Patent dated Dficembe! 8, 1915. Disclaimer filed July 8, 1931, by theassignees, Wood Corporation of Delaware, and Wood Hydraulic Hoist & BodyCompany.

Hereby make disclaimer to that part of the specification reading asfollows:

Any form of prime mover in place of the engine B may be employed fordriving the equivalent of the pump 13 and any form of impelling mediumsuch as oil, water and other liquid, gas or air may be used.

Your petitioners further with respect to claim 5 of said Letters PatentNo. 1,165,825 hereby make disclaimer with respect to the improvementsdescribed and defined in said claim 5 of so much thereof as is in excessof the following:

A seli-propelling vehicle having a propelling motor, a dumping bodytiltably mounted on said vehicle adjacent the rear end of the vehicle, agear pump connected with said motor an upwardly extending cylinderhaving its piston operatively connected to said body, and a system ofpassages connecting the ingress and egress openings of said gear pumpwith the upper and lower ends of said cylinder, said piston beingadapted to partly overlap the upper connection of said passages therebyforming a duct around the piston.

Your petitioners further hereby make disclaimer with respect to theimprovement described and delinod in claim 12 of said Patent No.1,165,825, of so much thereof as is in excess of the following:

A sell-propelled vehicle having a propelling motor, a dumping bodytiltingly mounted on said vehicle adjacent the rear end of the vehicle,a gear pump connected to said motor, a hydraulic cylinder interposedbetween said gear pump and body and having its piston operativelyconnected to said body, a system of piping connecting said gear pumpwith said cylinder and means for establishing communication between theportions of said cylinder above and below said piston and with saidpiping to prevent the piston locking in said cylinder.

(Oflicial Gazette August 1,, 1931.)

